*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.big{
    display: flex;
    margin: auto;
    margin-top: 10vh;
    width: 80vw;
    height: 80vh;
    border-radius: 40px;
}
.big div{
    position: relative;
    flex: 1;
    margin-right:30px;
    border-radius: 40px;
    background-color: aqua;
    background-image: url(../img/1.avif);
    background-position: center;
    transition: all .7s ease-in;
}
.big div:last-child{
    margin: 0;
}
.big div.active{
    flex: 9;
}
.big div h3{
    position: absolute;
    bottom: 20px;
    margin-left: 15px;
    color: white;
    opacity: 0;
    transition: all .3s ease-in .2s;
}
.big div.active h3{
    opacity: 1;
}